INFO: task syz-executor:8051 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-05877-g1a9239bb4253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:23744 pid:8051  tgid:8051  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5366 [inline]
 __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747
 __schedule_loop kernel/sched/core.c:6824 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6839
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6896
 __mutex_lock_common kernel/locking/mutex.c:664 [inline]
 __mutex_lock+0x7fa/0x1000 kernel/locking/mutex.c:732
 add_one_compat_dev+0x10d/0x710 drivers/infiniband/core/device.c:933
 rdma_dev_init_net+0x1f5/0x280 drivers/infiniband/core/device.c:1175
 ops_init+0x349/0x5b0 net/core/net_namespace.c:138
 setup_net+0x289/0x9f0 net/core/net_namespace.c:364
 copy_net_ns+0x33f/0x570 net/core/net_namespace.c:518
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x5e2/0xad0 kernel/fork.c:3337
 __do_sys_unshare kernel/fork.c:3408 [inline]
 __se_sys_unshare kernel/fork.c:3406 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff101b8e967
RSP: 002b:00007ffe09a84be8 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff101da5f40 RCX: 00007ff101b8e967
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007ff101da6738 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8ed3a260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6761
3 locks held by kworker/u8:2/36:
 #0: ffff88814d9f1148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88814d9f1148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
 #1: ffffc90000ad7c60 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc90000ad7c60 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
 #2: ffffffff900e5788 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
 #2: ffffffff900e5788 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4730
5 locks held by kworker/u8:5/1110:
2 locks held by getty/5590:
 #0: ffff8880316950a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5819:
3 locks held by kworker/1:9/7910:
 #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
 #0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
 #1: ffffc900040bfc60 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
 #1: ffffc900040bfc60 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319